'\" et
.TH SHUTDOWN "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
.\"
.SH PROLOG
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
.\"
.SH NAME
shutdown
\(em shut down socket send and receive operations
.SH SYNOPSIS
.LP
.nf
#include <sys/socket.h>
.P
int shutdown(int \fIsocket\fP, int \fIhow\fP);
.fi
.SH DESCRIPTION
The
\fIshutdown\fR()
function shall cause all or part of a full-duplex connection on the
socket associated with the file descriptor
.IR socket
to be shut down.
.P
The
\fIshutdown\fR()
function takes the following arguments:
.IP "\fIsocket\fR" 12
Specifies the file descriptor of the socket.
.IP "\fIhow\fR" 12
Specifies the type of shutdown. The values are as follows:
.RS 12 
.IP SHUT_RD 12
Disables further receive operations.
.IP SHUT_WR 12
Disables further send operations.
.IP SHUT_RDWR 12
Disables further send and receive operations.
.RE
.P
The
\fIshutdown\fR()
function disables subsequent send and/or receive operations on a
socket, depending on the value of the
.IR how
argument.
.SH "RETURN VALUE"
Upon successful completion,
\fIshutdown\fR()
shall return 0; otherwise, \-1 shall be returned and
.IR errno
set to indicate the error.
.SH ERRORS
The
\fIshutdown\fR()
function shall fail if:
.TP
.BR EBADF
The
.IR socket
argument is not a valid file descriptor.
.TP
.BR EINVAL
The
.IR how
argument is invalid.
.TP
.BR ENOTCONN
The socket is not connected.
.TP
.BR ENOTSOCK
The
.IR socket
argument does not refer to a socket.
.P
The
\fIshutdown\fR()
function may fail if:
.TP
.BR ENOBUFS
Insufficient resources were available in the system to perform the
operation.
.LP
.IR "The following sections are informative."
.SH "EXAMPLES"
None.
.SH "APPLICATION USAGE"
None.
.SH "RATIONALE"
None.
.SH "FUTURE DIRECTIONS"
None.
.SH "SEE ALSO"
.IR "\fIgetsockopt\fR\^(\|)",
.IR "\fIpselect\fR\^(\|)",
.IR "\fIread\fR\^(\|)",
.IR "\fIrecv\fR\^(\|)",
.IR "\fIrecvfrom\fR\^(\|)",
.IR "\fIrecvmsg\fR\^(\|)",
.IR "\fIsend\fR\^(\|)",
.IR "\fIsendto\fR\^(\|)",
.IR "\fIsetsockopt\fR\^(\|)",
.IR "\fIsocket\fR\^(\|)",
.IR "\fIwrite\fR\^(\|)"
.P
The Base Definitions volume of POSIX.1\(hy2017,
.IR "\fB<sys_socket.h>\fP"
.\"
.SH COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1-2017, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, 2018 Edition,
Copyright (C) 2018 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group.
In the event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
.PP
Any typographical or formatting errors that appear
in this page are most likely
to have been introduced during the conversion of the source files to
man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
